mathsurgery - Statistical enquiry year 8

All
• Suggest possible answers, given a question that can be addressed by statistical methods
• Decide which data would be relevant to an enquiry and possible sources
• Plan how to collect and organise small sets of data from surveys and experiments:
(i) design data collection sheets or questionnaires to use in a simple survey
(ii) construct frequency tables for gathering discrete data, grouped where appropriate in equal class intervals
• Collect small sets of data from surveys and experiments, as planned
• Compare two simple distributions using the range and one of the mode, median or mean
• Write a short report of a statistical enquiry, including appropriate diagrams, graphs and charts, using ICT as appropriate; justify the choice of presentation

Most
• Make accurate mathematical graphs on paper and on screen
• Discuss a problem that can be addressed by statistical methods and identify related questions to explore
• Decide which data to collect to answer a question, and the degree of accuracy needed; identify possible sources; consider appropriate sample size
• Plan how to collect the data; construct frequency tables with equal class intervals for gathering continuous data and two-way tables for recording discrete data
• Collect data using a suitable method (e.g. observation, controlled experiment, data logging using ICT)
• Compare two distributions using the range and one or more of the mode, median and mean
• Write about and discuss the results of a statistical enquiry using ICT as appropriate; justify the methods used

Some
• Suggest a problem to explore using statistical methods, frame questions and raise conjectures
• Discuss how different sets of data relate to the problem; identify possible primary or secondary sources; determine the sample size and most appropriate degree of accuracy
• Design a survey or experiment to capture the necessary data from one or more sources; design, trial and if necessary refine data collection sheets; construct tables for gathering large discrete and continuous sets of raw data, choosing suitable class intervals; design and use two-way tables
• Gather data from specified secondary sources, including printed tables and lists, and ICT-based sources, including the internet
• Compare two or more distributions and make inferences, using the shape of the distributions and appropriate statistics
• Review interpretations and results of a statistical enquiry on the basis of discussions; communicate these interpretations and results using selected tables, graphs and diagrams

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Statistical enquiry year 8